ANGERY!!!....At himself?

So just a bit ago (Actually a few hours ago) I was checking on Swordtail and he had his mouth open and his beard was all puffed out! I was freaking out, thinking something was wrong
Turns out he was looking at his own reflection in one of the glass walls of his enclosure and I guess thought it was another beardie

Quite funny in my opinion, wish I took a picture but I didn't so just have this picture of him with a hat